UML - how to protect the loop fs

[Jesore]

What I want to do is to implement a backup server on our "power machine" in case one of our smaller servers goes down. My first idea was to use UML (user mode linux) to boot an exact copy of the other system and to let the databases replicate. Now this small system and especially the db are very important to our company and the server is a very small, low profile system and very tight security wise.
The "power server" is the exact opposite. Several services (mail, web, db, jboss) and lots of traffic. So the chance that this system is compromised is considerably larger that the small one gets hacked.
What I want to know is, is there a good way to protect the UML-server filesystem from the underlying main server. I know, with root access they can delete any files, but deleting wouldn't be a problem as it only is the replica. Reading the data on it really is the problem.

Is UML possible with cryptoloop filesystems? Or is the whole idea plain stupid?

Jesore

[Jesore]

I just hope this is the right forum to ask - as UML is a kernel patch, I thought it belongs here. Sometimes it really is hard to tell.

Jesore
P.S. *BUMP

[Jesore]

I guess it was a bad idea anyway.